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Subchapter 13. Logging and Sawmill Safety Orders
Article 4. Signals and Communication Systems

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§6272. Radio Signal Systems.

When space transmission of radio signals, including voice, is used under and in accord with authorization granted by the Federal Communications Commission to initiate any whistle, horn, bell, or other audible signaling device or voice conveyance; or when such transmission of radio signals, including voice, is used to activate or control any machine, material handling device, or other equipment hazardous to workers; the following shall apply:

(a) Registration of tone frequency and area of use for each radio unit used in the control and activation of any signal, machine, or equipment must be obtained from the Division of Occupational Safety and Health, by an employer, prior to placing the unit in operation. Registration will be issued on the basis of compliance with Safety Orders of this Section and with the additional criteria contained in Appendix A.

(b) Radio equipment shall not be used without displaying the required registration. Registration must be prominently displayed on the receiver of the unit. On radio-controlled carriages, registration must be prominently displayed on the transmitter in the yarder.

(c) Applicants for registration shall submit the following information on the equipment to the Division of Occupational Safety and Health.

(1) Assigned radio frequency.

(2) Manufacturer of the unit.

(3) Serial number of the receiver.

(4) The signaling format and codes (i.e., tone frequencies in the case of tone coded systems).

(5) Intended use or function of the unit.

(6) Designated area in which the equipment will be used.

(d) Before moving any unit from one assigned area to another, new registration shall be secured from the Division. The provisions of Section 6272(c)(1) and (2) shall also apply in moving a radio control from one assigned area to another.

(e) No individual or company may reserve tone frequencies within an area more than 30 days before the frequencies will be put into use. Users shall notify the Division within 30 days after the radio-signaling device is:

(1) Permanently retired (in what manner).

(2) Sold (to whom).

(3) Stolen.

(f) Additional systems shall be certified in advance as spares, providing they are used only as replacements for malfunctioning systems during the time required to repair the original equipment.

(g) Each radio receiver shall have its tone frequencies in hertz (CPS), the manufacturer's serial number, and the assigned radio frequency permanently indicated on the outside of the case. When the duration or width of the tone frequencies performs a function, the tone duration/width shall also be permanently indicated on the outside of the case.

(h) Single tone frequency shall not be used on radio equipment designed to initiate a whistle or other audible signal, or to activate or control any machine, material-handling device, or other device hazardous to workers.

(i) All adjustment, repair, or alteration of radio signaling devices shall be done only by or under the immediate supervision and responsibility of a person holding a first or second class commercial radio operator's license, either radio telephone or radio telegraph, issued by the Federal Communications Commission. All replacements parts shall be of such quality as to cause the unit to meet the minimum performance specifications outlined in Appendix A.

(j) Equipment or machines being controlled by radio control devices shall be designed and built to fail/safe or stop in case of failure of the radio control device.

(k) When interference, overlap, fadeout, or blackout of radio signals is encountered, the use of the device shall be immediately discontinued, and not resumed until the source of trouble has been detected and corrected.

(l) Two transmitters shall be in the visual or vocal vicinity of the rigging crew at all times. Spare transmitters shall be guarded against accidental activation.

(m) Two or more receivers on the same radio frequency with the same tone coding frequency is prohibited.

EXCEPTION: A second receiver may be used for monitoring provided it does not actuate or interfere with the primary receiver.

NOTE: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.


1. Amendment of initial paragraph only filed 2-6-85; effective thirtieth day thereafter (Register 85, No. 6).

2. New exception to subsection (m) filed 5-1-97; operative 5-31-97 (Register 97, No. 18).

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